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Condensed Consolidated Statement of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 633,882
Net income	$ 42,239	$ 33,717	105,278	$ 99,267
Pension and post-retirement plan actuarial gains, net of tax	2,257	2,651	5,658	8,039
Income attributable to noncontrolling interests	(372)	(346)	(822)	(706)
Preferred dividends	(10)	(10)	(30)	(30)
Ending Balance	702,067		702,067
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	971,453	906,244	935,577	868,675
Net income	42,611	34,063	106,100	99,973
Income attributable to noncontrolling interests	(372)	(346)	(822)	(706)
Common dividends	(16,270)	(14,614)	(47,185)	(42,575)
Preferred dividends	(10)	(10)	(30)	(30)
Reclassification due to the adoption of ASU 2018-02	3,772		3,772
Ending Balance	997,412	925,337	997,412	925,337
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(203,406)	(181,525)	(218,927)	(171,762)
Foreign currency translation adjustments	(16,091)	(4,755)	(16,115)	(19,235)
Pension and post-retirement plan actuarial gains, net of tax	2,257	2,651	5,658	8,039
Unrealized net gain on available-for-sale securities (Note 17)	(9)		554
Reclassification from accumulated other comprehensive loss into net income	(212)		15,147	(774)
Income attributable to noncontrolling interests	227	194	221	297
Reclassification due to the adoption of ASU 2018-02	(3,772)		(3,772)
Ending Balance	(217,234)	(183,435)	(217,234)	(183,435)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	6,093	5,234	5,637	4,977
Income attributable to noncontrolling interests	145	152	601	409
Ending Balance	$ 6,238	$ 5,386	$ 6,238	$ 5,386

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